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Lightning
Grade 5
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Surviving in Ecosystems

Different kinds of organisms interact with each other in a number of different ways. In nature a relationship between two kinds of organisms that lasts over a period of time is called . When a relationship between two kinds of organisms benefits both of them, it is called . For example, the yucca moth the yucca flower, and the yucca flower provides a place for yucca moth to develop. A relationship in which one kind of organism lives on or in another organism and may that organism is called parasitism. The organisms parasites feed on are called . A parasite of dogs and cats is . A relationship where one organism benefits from another without helping or harming it is called . Certain tropical fish live unharmed among the poisonous tentacles of , which provide safety for the fish.